NDLI: Nitrogen retention in a floodplain backwater of the upper Mississippi River (USA)

Content Provider	Springer Nature Link
Author	James, William F.
Copyright Year	2009
Abstract	Backwaters connected to large rivers retain nitrate and may play an important role in reducing downstream loading to coastal marine environments. A summer nitrogen (N) inflow-outflow budget was examined for a flow-regulated backwater of the upper Mississippi River in conjunction with laboratory estimates of sediment ammonium and nitrate fluxes, organic N mineralization, nitrification, and denitrification to provide further insight into N retention processes. External N loading was overwhelmingly dominated by nitrate and 54% of the input was retained (137 mg m−2 day−1). Ammonium and dissolved organic N were exported from the backwater (14 and 9 mg m−2 day−1, respectively). Nitrate influx to sediment increased as a function of increasing initial nitrate concentration in the overlying water. Rates were greater under anoxic versus oxic conditions. Ammonium effluxes from sediment were 26.7 and 50.6 mg m−2 day−1 under oxic and anoxic conditions, respectively. Since anoxia inhibited nitrification, the difference between ammonium anoxic–oxic fluxes approximated a nitrification rate of 29.1 mg m−2 day−1. Organic N mineralization was 64 mg m−2 day−1. Denitrification, estimated from regression relationships between oxic nitrate influx versus initial nitrate concentration and a summer lakewide mean nitrate concentration of 1.27 mg l−1, was 94 mg m−2 day−1. Denitrification was equivalent to only 57% of the retained nitrate, suggesting that another portion was assimilated by biota. The high sediment organic N mineralization and ammonium efflux rate coupled with the occurrence of ammonium export from the system suggested a possible link between biotic assimilation of nitrate, mineralization, and export.
Starting Page	61
Ending Page	69
Page Count	9
File Format	PDF
ISSN	10151621
Journal	Aquatic Sciences
Volume Number	72
Issue Number	1
e-ISSN	14209055
Language	English
Publisher	SP Birkhäuser Verlag Basel
Publisher Date	2009-09-19
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ammonium Backwaters Denitrification Nitrification Nitrate Rivers Life Sciences Ecology Oceanography Marine & Freshwater Sciences Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Water Science and Technology Ecology, Evolution, Behavior and Systematics

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